[Bug 209470] Kernel Panic Seen after using Dtrace FBT provider with the kernel module on arm
bugzilla-noreply at freebsd.org
bugzilla-noreply at freebsd.org
Thu May 12 18:15:48 UTC 2016
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=209470
Bug ID: 209470
Summary: Kernel Panic Seen after using Dtrace FBT provider with
the kernel module on arm
Product: Base System
Version: 10.1-RELEASE
Hardware: arm
OS: Any
Status: New
Severity: Affects Many People
Priority: ---
Component: kern
Assignee: freebsd-bugs at FreeBSD.org
Reporter: abhya007 at gmail.com
I was using Dtrace using the FBT provider on an arm platform with witness
enabled. When FBT is used with the kernel module, it generates a kernel
panic or the system becomes unresponsive. Is this problem know or seen
before. I am copying the kernel backtrace below for reference. The issue
seems to be with a blockable sleep lock(kld_sx) acquired which is
conflicting with the td->td_critnest positive value.
The following is the kernel backtrace :
dtrace: script 'dtrace_script' matched 1 probe
panic: acquiring blockable sleep lock with spinlock or critical section held
(sx) kernel linker @
/.amd/svl-engdata1vs1/occamdev/build/freebsd/head/20160325.175306_fbsd-bui
lder_head.324786/src/sys/kern/kern_linker.c:552
newpanic = 1, trace_on_panic = 1, debugger_on_panic = 0
[panic] backtrace is as follows:
KDB: stack backtrace:
db_trace_self() at db_trace_self
pc = 0xc128bb68 lr = 0xc1039f8c (db_trace_self_wrapper+0x30)
sp = 0xea736798 fp = 0xea7368b0
r10 = 0xc63bc6a0
db_trace_self_wrapper() at db_trace_self_wrapper+0x30
pc = 0xc1039f8c lr = 0xc1180e3c (kdb_backtrace+0x3c)
sp = 0xea7368b8 fp = 0xea7368c0
r4 = 0xc13d4b64 r5 = 0x00000001
r6 = 0xc139c600 r7 = 0xc139c640
kdb_backtrace() at kdb_backtrace+0x3c
pc = 0xc1180e3c lr = 0xc1148400 (vpanic+0xec)
sp = 0xea7368c8 fp = 0xea7368e0
r4 = 0x00000100 r10 = 0xc63bc6a0
vpanic() at vpanic+0xec
pc = 0xc1148400 lr = 0xc1148314 (vpanic)
sp = 0xea7368e8 fp = 0xea736900
r4 = 0xc13c7018 r5 = 0xc12fc5ed
r6 = 0xea73690c r7 = 0xc13c6f80
r8 = 0xc12e76f0 r9 = 0xc139f740
vpanic() at vpanic
pc = 0xc1148314 lr = 0xc119b080 (witness_checkorder+0x128)
sp = 0xea736908 fp = 0xea736960
r4 = 0xea73690c r5 = 0x00000000
r6 = 0x00000009 r7 = 0xc12d6222
r8 = 0xc155e6c0 r9 = 0x00000228
witness_checkorder() at witness_checkorder+0x128
pc = 0xc119b080 lr = 0xc114fafc (_sx_xlock+0x80)
sp = 0xea736968 fp = 0xea736988
r4 = 0x00000228 r5 = 0xc12ef932
r6 = 0xc13c5800 r7 = 0xc13c57f0
r8 = 0x00000000 r9 = 0x0000003c
r10 = 0x0000000f
_sx_xlock() at _sx_xlock+0x80
pc = 0xc114fafc lr = 0xc112583c (linker_file_foreach+0x34)
sp = 0xea736990 fp = 0xea7369a8
r4 = 0xc13c57d0 r5 = 0xea7369b0
r6 = 0xc12a6bc0 r7 = 0xc6e50c70
r8 = 0xc13c57f0 r10 = 0x0000000f
linker_file_foreach() at linker_file_foreach+0x34
pc = 0xc112583c lr = 0xc12a67d0 (unwind_stack_one+0x5c)
sp = 0xea7369b0 fp = 0xea7369d8
r4 = 0xea736b38 r5 = 0xea7369b0
r6 = 0x00000000 r7 = 0xc6e50c70
r8 = 0xc137e698 r10 = 0x0000000f
unwind_stack_one() at unwind_stack_one+0x5c
pc = 0xc12a67d0 lr = 0xc6e4d688 ($a+0x2e8)
sp = 0xea7369e0 fp = 0xea736bb0
r4 = 0xc86a0400 r5 = 0x00000000
r6 = 0xea736b38 r7 = 0x00000004
r8 = 0xc8b14018 r9 = 0x0000003c
r10 = 0x0000000f
$a() at $a+0x2e8
pc = 0xc6e4d688 lr = 0xc6e8823c (fbt_invop+0x94)
sp = 0xea736bb8 fp = 0xea736bd0
r4 = 0xc6fb3040 r5 = 0xc6e7a058
r6 = 0x00000000 r7 = 0xc6b16ca0
r8 = 0xc63bc6a0 r9 = 0xc119be08
r10 = 0x00000000
fbt_invop() at fbt_invop+0x94
pc = 0xc6e8823c lr = 0xc6e6466c ($a+0x38)
sp = 0xea736bd8 fp = 0xea736be8
r4 = 0xea736c70 r5 = 0xffffffff
r6 = 0xc119be08 r10 = 0x00000000
$a() at $a+0x38
pc = 0xc6e6466c lr = 0xc12a66f0 (undefinedinstruction+0x3b8)
sp = 0xea736bf0 fp = 0xea736c68
r4 = 0xea736c70 r5 = 0xc63bc6a0
r6 = 0x00000000 r7 = 0xe7f000f0
undefinedinstruction() at undefinedinstruction+0x3b8
pc = 0xc12a66f0 lr = 0xc128e5a8 (exception_exit)
sp = 0xea736c70 fp = 0xea736d48
r4 = 0xc5b25ca0 r5 = 0xc6032028
r6 = 0xc155e6c0 r7 = 0xc5b201a0
r8 = 0xc140e194 r9 = 0xc155e70c
r10 = 0x00000009
exception_exit() at exception_exit
pc = 0xc128e5a8 lr = 0xc119b5dc (witness_checkorder+0x684)
sp = 0xea736d00 fp = 0xea736d48
r0 = 0xc5b201a0 r1 = 0xc5b25ca0
r2 = 0x0000003c r3 = 0xc12fd0fa
r4 = 0xc5b25ca0 r5 = 0xc6032028
r6 = 0xc155e6c0 r7 = 0xc5b201a0
r8 = 0xc140e194 r9 = 0xc155e70c
r10 = 0x00000009 r12 = 0xc155e6c0
witness_lock_order_add() at witness_lock_order_add
pc = 0xc119be08 lr = 0xc114fafc (_sx_xlock+0x80)
sp = 0xea736d50 fp = 0xea736d70
r4 = 0x00000aba r5 = 0xc12dccfb
r6 = 0xc6032038 r7 = 0xc6032028
r8 = 0x00000000 r9 = 0xc13c4988
r10 = 0x00000002
_sx_xlock() at _sx_xlock+0x80
pc = 0xc114fafc lr = 0xc107dcdc (usbd_enum_lock+0x40)
sp = 0xea736d78 fp = 0xea736d80
r4 = 0xc6032000 r5 = 0xc12dccfb
r6 = 0xc63d2500 r7 = 0xc63e8800
r8 = 0x00000001 r10 = 0x00000002
usbd_enum_lock() at usbd_enum_lock+0x40
pc = 0xc107dcdc lr = 0xc10869b0
(uhub_explore_handle_re_enumerate+0x20)
sp = 0xea736d88 fp = 0xea736d98
r4 = 0xc6032000 r5 = 0xc6032000
uhub_explore_handle_re_enumerate() at uhub_explore_handle_re_enumerate+0x20
pc = 0xc10869b0 lr = 0xc1089bf4 ($a+0x3c8)
sp = 0xea736da0 fp = 0xea736de8
r4 = 0xc659a168 r5 = 0xc6032000
r6 = 0xc63d2500 r10 = 0x00000002
$a() at $a+0x3c8
pc = 0xc1089bf4 lr = 0xc1070f50 (usb_bus_explore+0xf0)
sp = 0xea736df0 fp = 0xea736e00
r4 = 0xc6052c78 r5 = 0xc63e8800
r6 = 0xc6052eb0 r7 = 0xc12daed8
r8 = 0xc13c49a0 r9 = 0xc12df2a9
r10 = 0xc6052d0c
usb_bus_explore() at usb_bus_explore+0xf0
pc = 0xc1070f50 lr = 0xc108c014 (usb_process+0xdc)
sp = 0xea736e08 fp = 0xea736e28
r4 = 0xc6052cfc r5 = 0xc6052d04
r6 = 0xc6052d5c r7 = 0xc12df29d
usb_process() at usb_process+0xdc
pc = 0xc108c014 lr = 0xc1117c94 (fork_exit+0x84)
sp = 0xea736e30 fp = 0xea736e48
r4 = 0xc63bc6a0 r5 = 0xc5f7cac8
r6 = 0xc108bf38 r7 = 0xc6052cfc
r8 = 0xea736e50 r9 = 0x00000000
r10 = 0x00000000
fork_exit() at fork_exit+0x84
pc = 0xc1117c94 lr = 0xc128e538 (swi_exit)
sp = 0xea736e50 fp = 0x00000000
r4 = 0xc108bf38 r5 = 0xc6052cfc
r6 = 0x00000000 r7 = 0x00000000
r8 = 0x00000000 r10 = 0x00000000
swi_exit() at swi_exit
pc = 0xc128e538 lr = 0xc128e538 (swi_exit)
sp = 0xea736e50 fp = 0x00000000
KDB: Current process: usb
[panic] backtrace end
[panic] rebooting kernel with options 104
Uptime: 7m58s
Had an email exchange with Mark Johnston who agreed upon a bug being filed
about this.
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